MPO and susceptibility to pneumonia measurement: For the search of predictors of pneumonia severity in pregnant women in the main group, a multivariate regression analysis was conducted, incorporating clinical (age, BMI, gestational age, lung damage characteristics from computer tomography), laboratory (polymorphonuclear leukocytes, rod-shaped and segmented neutrophils), and cytochemical (succinate dehydrogenase, myeloperoxidase, cationic proteins, NETs) parameters as independent variables.